Drawing-board table



F. 0. WEYDELL.

DRAWING BOARD TABLE.

APPHCATION FILED DEC. 12. 1919.

H 5% Is mm nn w m2 n W a D1 F. 0. WEYDELL.

DRAWING BOARD TABLE.

APPLICATION FILED DEC.12,1919

EETS-SHEET 2.

Patented Apr. 5, 1921.

'FFEQB FRANK OSCAR WEYDELL, OF CHICAGO, ILLINOIS.

DRAWING-BOARD TABLE.

Specification of Letters latent.

Patented Apr. 5-, 1921.

Application filed December 12, 1919. Serial No. 344,371.

To all whom it may concern:

Be it lmown that I, FRANK O. WEYDELL, a citizen of the United States, aresident of Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Drawing-Board Tables, of whichthe following is a specification.

My invention relates to tables, ordinarily used for drawingboards, butmay be used for other purposes, and the invention consists in certainnovel and desirable details of construction, which permit a very cheaptable to be made and one of exceptional utility.

Drawing boards as ordinarily made have usually been made entirely ofwood.

Drawing boards are considered almost entirely from a utilitarianstandpoint and therefore they have not been finished or made of fancywoods, so that usefulness and cost have been the controlling factors inmarketing a drawing board.

elevation of'the board.

Fig. 2 is a section on line 22 of Flg. 5.. Fig. 3 is a side elevation ofone of the segment frame pieces, to which the board is connected.

Fig. 4. is an edge view of the segment shown in Fig. 3.

Fig. 4 is a detail of a part of the segment shown in Fig. 3.

Fi 5' is a vertical sectional elevation subs stantlally through thecenter of the machine at right angles to the front side shown in Fig. 1.

Fig. 6 is a sectional elevation on line 66 of Fig. 1.

P Fig. 7 is a sectional plan on line 7-7 of Fig. 8 is a sectional detailon line 8-8 of Fig. 6.

Fig. 9 is an end elevation of the thimble detail later described. 1

Fig. 10 is a section on line 1010 of Fig. 9.

Fig. 11 shows details of a locking button used to hold the drawing boardin position on its guides.

In the drawing 1 indicates the ordinary wooden board member of a drawingboard, and this board is mounted on ordinary stifiening crossbars ofwood, indicated by 2, 3 indicates wooden slide pieces, which are fixedto the board or to the cross pieces 2. 1 indicates wooden guide beams orblocks, which are mounted on to segments made of castings as indicatedby 5.

The segments 5 are secured by the pivot screws 6 to arms 7 castintegrally with the tubular body 8, which is provided with the sockethead 9, centrally locatedon the tubu 'lar body and offset therefrom asshown in the drawing. This socket 9 is fastened by a screw or bolt 10into the cross piece 11, cast into the head of a tubular bar 12,provided with the threads 13.

In the bottom of this tubular bar is a secondary cross member 14%, whichis made purposely for centering this bar for chas ing up the threads 13.I prefer to cast these threads and then just clean them up by a chasingtool in the lathe without being at the expense of machining a completethread.

Secured on to the thread 13 there is a screw threaded hand wheel 15, andthis hand wheel 15 rests on the top of the hollowpedestal 16 and thispedestal is provided with. the lugs 17 and an open space 18 for a shortdistance from the upper end of the barrelof the pedestal 16.

A screw 19, is threaded into a nut. 20, which is embedded in a cavityinto one of the lugs 17, so that this nut 20 may not turn when the screw19 is turned for the purpose of loosening or tightening the screw. Ahandle 21 enables the operator to manipulate this screw 19, and throughthe spring of the barrel of the pedestal 16, in the re gion of the slot18, the operator may by the handle 21, clamp the tubular member 12in thehub of the pedestal.

A small rib or a flange 23 on the bottom edge of the hub of thehandvwheel 15, is engaged by small clips 24, (see Figs. 1 and 6), andthese} clips are secured to the pedestal 16 by bolts 25, having nuts 26on the inside of the barrel of the pedestal below A the region of theclamping zone 22.

The little clips 24 also embrace a bead 27 on the head of the pedestalso that the bolts 25 do not take all the strain and this bead alsoserves to hold the blocks in upright position and permits only one screwor bolt 25 to be used in holding the blocks 24 in for the comfort of thedraftsman stools are provided higher than the ordinary chairs and thislifts the draftsmans feet from the floor. For the comfort of thedraftsman 1 provide the foot rest 28, which is made of wood or metal asdesired and is supported on arms 29, provided with notches 30, that hookover integral lugs 31 in the arms 7. The arms 29 rest at 32 (see Fig. 5)against the tubular cross member 8 and thus are held in a steadyposition. Two sets of notches are provided so that two difierent heightsof the board or foot rest 28 may be had for the comfort of thedraftsman.

A small table 33 containing a drawer 34, is hinged at 35 to an arm 36pivoted at 37 to the secondary arm 38, which is hinged at 39 to studs 40in the cross member 8, whereby the drawer may be swung beneath the tableor outwardly therefrom.

The segments 5 are secured in desired angular adjustment by hand wheels41 screwed on to a rod 42 on each end thereof, and this red 42 passesthrough the slot 43 of the segment 5.

A washer 62 is placed under the end of the head of the hand wheel 41 andin contact with ribs 44, and at the end of this lot 43'and ribs 44, theribs for a short distance at each end are higher, as indicated by 45(see Fig. 3) and the two dotted positions 46 in Fig. 3 indicate thelocation of the clamping wheels 41 in horizontal and vertical. positionof the table shown in Fig. 6, one of which last mentioned positions isdotted.

ln the normal adjustment of the board about the axis or pivot 6 of thesegments, the screw 41, or either one of them, will be loosened slightlyand then the board may be rocked as desired to any position between the90 degree limits indicated.

' However, when a little more movement is desired in very extremepositions, the clamp,- ing wheels 41 are further loosened, which permitsthe washers 62 to lift up over the little high portions 45 and thenallow the movement of the rod 42 the full limit ofthe length of the slot43 of the segment.

The arms 7 are provided with the pivot bosses 47, through which thepivot bolts or studs 6 pass. Nuts 48 and 49 clamp this stud 6 into thearms 7. The nuts 48 are seated in a cavity in the arms, which preventstheir turning while the out-side nut 49 and the stud 6 itself arecontrolled by wrenches. The segments 5 are provided with the hubs 50, inwhich the studs 6 act as the hinge pins. A washer 51 under the head ofthe studs 50, aids in preventing the studs 6 from becoming loosened.

Where the rods 42 pass into the ends of the tubular body 8, T providebrass or other soft metalbushings 52., which are cast to size withoutmachining, and through these bushings I provide the slots or key ways 53and a pin 54, shown in Fig. 8, which passes through the rod 42 andslides freely in the slot 53 in the bushing 52 and thus the rod 42 ispermitted to move endwise sufhciently for the clamping purposes wheneither hand wheel is used, and the rotary motion is prevented so thatthe hand wheels 41 may act on the threads without turning the rod,through the medium of this pin 54. working in the slot 53 as abovementioned.

The holes in the tubular body 8 at the end thereof, into -whirh thebushings 52 are forced, are cored holes and not machined, and thepurpose of making the bushings 52 of brass or other soft metal is thatthey may be forced intothose cored holes without the necessity ofmachining the parts, and make a suiliciently tight fit for all practicalpur: poses and thus construction expense is saved.

The detail of securing the studs 6 into the arms 7, as before described,is a further detail which lessens the construction cost in this machine.

The method of securing the socket head 9 to the screw threaded tubularmember 12 is also a labor saving construction, for the drawing indicatesthat this socket 9 has a tapered hole which fits over the tapered end ofthe member 12 and thus the screw 10 is permitted to clamp the socket 9on to this piece 12 and secure a tight fit, even though no machining hasbeen done on the parts.

The drawing board itself, as before mentioned, is held on to the crossmembers or beams 4 by means of the pieces 3 which slide thereon. Theboard is held from moving in one direction off these slides by means ofa wedge-like button 55, which is shownin Figs. 6 and 11. by a screw 56into the board and interposed between the board and the moving button isa stationary wedge block 57.

In Fig. 6 the position of the button 55 is such that it abuts against across member 58 of the frame and prevents the drawing board from movingoff its slides in a right hand direction as indicated in said Fig. 6. Byrevolving the button 55 180 degrees, (see 11) it is made to liewholly'above the bar 58 and permit the drawing board itself to be movedoutward to the right on the guides as previously described.

This button 55 is secured Spring balancing devices 59, which con trolribbons 60, secured at 61 to the lower edge of the board, continuallyexert influence to push the board off the frame to the right in Fig. 6,and this spring balancing device is somewhat like a self coiling tapeline and is used in other arts for example, in a sash balance. Thebutton 55 holds the board in position normally, but when it is desiredto lift the board up or out farther this button 55 is revolved aspreviously described and the board is pushed outward to any positiondesired, inasmuch as the spring balancing device is not of itselfsufiicient to move the board under the friction of its weight, but onlysuhicient to neutralize the weight and part of the friction to assist inmaking the adjustment, so that it will be an easy matter to move theboard as desired, but the board normally stays, by friction, in anyposition in which it is placed as relates to sliding on the ways orguides 3. o

What I claim is 1. In apparatus of the class described, the combinationwith a pedestal having its hollow wall slotted vertically near its upperend and encircling an axial externally threaded post, of means forforcibly narrowing the slot to clamp the post, a nut resting on thepedestal and engaging the threads of the post, means for positivelyholding the nut down upon the pedestal, a socket secured on the top ofthe post and provided with a horizontal crossbar having near its ends,respectively, parallel laterally extending arms, drawing-board supportspivoted to the arms, respectively, to rock about a horizontal axis, adrawing-board carried by said supports, and means for clamping saidsupports in desired angular adjustment.

2. In devices of the class described, the combination with a hollowpedestal ar ranged to clamp an axial externally threaded post primarilysliding freely in the pedestal and supported by a nut working on thepost and resting on the pedestal, of a socket resting on the post andfixed to the middle region of a horizontal crossbar having rigid lateralarms at its ends, respectively, segments pivoted to said arms,respectively, to rock on a common horizontal axis and having circularslots, clamping devices engaging in one of the slots for fixing thesegment in desired angular adjustment, slides mounted on the segments,and a drawing board carried by the slides.

3. The combination with a hollow pedestal arranged to clamp an axialexternally threaded post engaged by a supporting nut resting on thepedestal, a socket fixed over the top of the post and carrying acrossbar having lateral parallel arms at its ends, respectively,segments pivoted to the arms to rock about a common horizontal axis, andhaving slots concentric with the segment pivots, clamping devicescarried by the arms, ex tending into the slots and locking the segmentsin any angular adjustment allowed by the slots, cross slides'mountedonthe segments, and a board secured to the slides.

4E. The combination with a pedestal and a vertical post carried thereby,of means for clamping together the post and pedestal, a nut engaging thethreads of the post to ad just it vertically, a crossbar supported bythe post and having lateral arms, segments pivoted to said arms,respectively to rock on a common horizontal axis and provided with slotsconcentric with the segment pivots, a rod carried by the crossbar,passing through the slots and carrying devices for locking it therein,and a drawing-board supported by the segments.

5. In a device of the class described, a drawing board mounted uponsegments and the segments pivoted upon a supporting frame structure andprovided with are shaped slots; clamping means for clamping the arcsections of the segments in any position through the length of theslots, the said segments provided with registering stops at each end ofa 90 degree sweep of the said segments about their pivots and alsoprovided with adjusting means which permits the adjustment at each endof the said are slots, beyond the ends of said 90 degree sweep of thesegments.

6. In a device of the class described, a main drawing board supportedupon a frame-work on slides which permit the adjustment of the boardtransversely of the frame-work, the said frame-work hinged or pivotedupon its sub-supporting means, and adapted to be revolved through anangular movement varying over a range of 90 degrees through the mediumof supporting segments having are shaped slots with 90 degreeregistering points in both directions and with a surplus movement beyondthese registering stops in either direction.

7. In a device of the class described, a vertical supporting segment fora drawing board pivoted to rotate about a horizontal axis for angularlyadjusting the board, and providedwith' arc-shaped slots engaged byclamping means; the said slots provided with registering or indicatingpoints over a range of 90 degrees, with clamping means adapted to befreely adjusted through the range of the said 90 degrees and providedwith extra adjustment on each end of the said 90 degrees.

8. In devices of the class described, the combination with a horizontalsupporting member having rigid arms with rocking segments pivotedthereto and further having bearings, carrying a clamping rod proje tingthrough ci cular slots in the segments, and provided with frictionallyheld soft metal bushings formed with a slotted aperture to carry andhold a pin passing through the clamping rod while allowing the latterslight longitudinal movement without material rotation, and threadedhand wheels upon the ends of the clamping rod, respectively.

9. In a device of the class described, a segment adapted to support thedrawing board through the means of a pivot or hinged member connectingit to the supporting frame work; a segmentally arranged slot forassisting in clamping the segment in angular movement about the pivot,such segment being thinner through the marginal portion through the arcof movement, and thicker at each end whereby a registering limit atvided.

10. In a device of the class described, the combination with a pedestal,of a terminally tapered vertically and revolubly adjustable axial postmounted in the pedestal, a socket fitting and rigidly clamped over thetapered upper end of the post, a frame carried by said socket, andboard-carrying devices hinged to the frame to rock about a horizontalaxis.

11. In a device of the class described, a

vertically arranged pedestal supporting the super-structure frame workupon which a drawing board is mounted; a screw threaded block mounted invertical arrangment within the pedestal, and supporting a horizontaltubular member of the frame, the ends of said tubular member providedwith extending arms, the ends of which are adapted to hold hinge pins orpivots connected to supported Segments, which rock about the said pinsor pivots and are provided with portions having arc-shaped slots thereinand adapted to register in alinement with a clamping rod which rodextends through the hollow horizontal supporting member; clamping handwheels on the ends of said rod adapted to clamp the segments to thehorizontal supporting member, and said clamping rod supported inbushings pressed into cavities in the said horizontal member.

12. The combination with a table-carrying pedestal, of an axial posttherein supporting near its upper end a horizontal frame member anditself revolubly and len gitudinally adjustable in the pedestal, meansgiven points is pro for clamping the post in adjusted position, meansfor hinging a table-supporting frame to said member, means for adjustingthe table transversely with respect to the hinge axis, and means forbalancing such movement of the board.

13. In a device of the class described, a board supported from the floorby a vertically arranged pedestal, provided with a central block adaptedto be raised or lowered in the pedestal; means for clamping the saidblock in the said pedestal and means for raising and lowering the saidblock within the pedestal, with a horizontally disposed supportingmember mounted upon the vertically arranged block within the pedestal,means for hinging the table supporting frame to the horizontalsup-porting member in combination with means for adjusting the boardacross the frame work in relation to the supporting pivots, and meansfor balancing the movement of the said board in its transverse action;said balancing means composed of a flexible ribbon actuated to draw intoa coil through the means of a coil spring.

14. In a device of the class described, a drawing board hinged to itssupporting frame; means for clamping the board in any given positionaround its hinge, said clamping means including a horizontal rodprovided with a screw threaded hand wheel on each end thereof, to clampthe board supporting means in angular adjustment, slotted aperturedbushings through which said rod passes, a pin passing through the rodand engaging the slotted aperture whereby the rod is prevented fromrotating in the clamping action, but may be. moved through a shortdistance horizontally.

15. The combination with a pedestal, of an axial externally screwthreaded post clamped inthe pedestal, a board-supporting frameworkabove, and a socket, forming part of the framework, passed over the topof the post and drawn down into rigid connection therewith by a screw.

Signed at Chicago, in the county of Cook and State of Illinois, this 8thday of November, 1919.

FRANK OSCAR WEYDELL.

Witnesses J. B. Jnrrnnson. B.J. BERNI-IARD.

